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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f3bac9f5739581f49bf50435e5938e5a821521270893ce7361dfde7879eb17' 
  AND token = 'GeDc88y+XIwxnGR8K3n6PXCbm9EKl/bv8U6fa2HGz8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}