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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97eeda0e6911e54a4a9bb66e56b031a1a3db4a172f7363704501532f054327b' 
  AND token = 'CBxiGiVffv2a3fBzPszxLJNKaESBQBp+ZRIQgtfFCO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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