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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9031641140804fb55c94847dbec421efb3fdc7f7ff3aefc25f0f39d0a247b6b0' 
  AND token = 'hE4bAAliUpsbs6tDnmy+M3cT/bS/pIXibHP1JU96/6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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