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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc0459fe158267660fac59410ca2059fc56f7ed1c5404237298ddcf1bb30303' 
  AND token = 'smDriTRj6/8gEhncMR89U5MywX2sw09LsrbcmR0lfEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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