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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b61bd7b40c657973b52b0810b4a37d495323d8683f798a43e66a278ad70a2b' 
  AND token = 'jEg3pHhoZ6XWbETdr15ar7DEEf1H50fM+Ikv38fDvs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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