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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c0fe9fbc12315298f3240056c7c092b9ecccd0c336740fbc4b3fab9c536568' 
  AND token = 'Mm6vun3v5tvzOSw8uj297zWp4jjKWqnb8c+ZpiPC/1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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