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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42fc4ec0e969fb6f6a23b86b583d2454b809eaaabc0a6d1eeefe4545f3e4a81' 
  AND token = 'GLoa8nuqxiNkppWfulv14kyjkILpEwsTQ3sm8KrUbWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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