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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5ec8053a554f40173284e117cff73b5d23f60a6a24796799318a61a0e25c9c' 
  AND token = 'K0gkEw7ihivvFOlBA2Yv7EZs13d/OnsUw4ZbPCoTKNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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