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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4faac9252bb7a67f7a94e969546d3de9e92073495a776d5a9966daf643082475' 
  AND token = 'RwY8CyMQwT6s+hv1dMtGOBhmZRpw/MABM9fPM9H4Ca4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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