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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df540135f9ce659596d7781ab8822ccd1590eb52bbe6f8d1d4dfc4507635006c' 
  AND token = 'kdTbVN++vSE44Sd1wZzfvteT7Bdy93/hYypg4xXfSlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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