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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05080c4dd08a26427f4d34625b6603d5cf4d70aebc3e031d870fe3c61bdf17b' 
  AND token = '6Tv58sriUOWUehzW8bolmvGsNIEWLF1ecq3xB8n6Ej4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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