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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247d193d6c6dc229b5356fe7c65c62af51c60ff3c48494657858432977014b14' 
  AND token = '6lBJbQ6SbwKns8M8GV1P6pUTr6VoMN/Y8Q3TPCB3FOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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