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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bbda87e635886612241c1c5ec84311f507328d07798b2cee6af8c2d8f7a625' 
  AND token = 'anOz3aGOJkFn4exvUkB8Zhz5DYqOe1wMBb/03gq1X8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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