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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5c9c2fe31c25832e2c7e4d03dcf412cf6702b5e60a796a0e02eca6c3bee1ff' 
  AND token = 'vQ2xPhEWt29yY/Pe9eayM3dvdZzdPykU9vpG7145RGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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