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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029b8bc43697e8ca7182d7fa7aa760ddfce161fbf8dc05d683e04608c19724ab' 
  AND token = 'O4k0GTPpI1nF7mFbmGeX/BC7lVZ8NitqQxAaPib6pz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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