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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c0132fdbde57cdc5226b109955126ef06d52884e1dd3fbf7615d340caf3a1a' 
  AND token = 'idd8dTiDFYBT2FA5USnXTuIl7z8QIHu1nn6o87LwD5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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