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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7544d1a27a05682342b87d40e0e035e79187953491ba395a536487cbea4075e9' 
  AND token = 'JL4hXRRTIIgbbMguAdor7dxmmlFl8e34wFr2KYvRvrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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