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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0fc34dc06ca9148af73754a9080b7bf0003b01662f20204ffb09138035d75a' 
  AND token = 's9fcyzRQWyNHOtOOp7rXBOEmgBpXcWvoUU7gbyiAOmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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