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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4827bc85b0dccfebeaa95df25605670775b6a4be9577eac9f5bb0fefbeb0037' 
  AND token = '2nuIzkfQ268xt9O5aOV0ov9Jjykm/0uEbsQVroG6SRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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