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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca80a58fce9097c0e5a72feb76b9da0cc86643a25db2c7211c64f1b5e4023fb' 
  AND token = 'g4KW87rz35N6madKbfy2wGwtJ6zJfki01UM1Kfo2kSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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