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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd70cff5c62299983dba2d9b9b8e85c515a13aa1573bcf8e61f6bb974954b80c' 
  AND token = '6PW+qlEfsUGUvRNXKfgN+H7RuFb85G3bFkeY4E1UqEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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