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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ad8c4da9d00c27dd9169db29f28924c16734fbb6cfceeab42bcf1802c74c97' 
  AND token = '9bmtHxvCtcScY1Jq3LABUnmXVw9eEM8wgYXjHe5E0m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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