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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49683852f407ab87a05a1e0469c89cda00f7635007cd170a2f8f2f24df23e73' 
  AND token = '99xZVtwLwXVeNUn1d8K9XOjruHif03TtSbqOt0MA7pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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