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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e73660ca24aa10da1c331a352b67a615cb7a28f2f6d8b22117e094438403de' 
  AND token = 'fr/Xm739YrxU79f0nPlEHgeR6qdpV5QLP1kNtNfhQgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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