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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94957e5aad5e1d114226e8fa83a9c14cb7cee6f786797d1471a9871f7c1ea3e8' 
  AND token = 'TByZ5pRH+0quug/PMpqP5ADK2EK7Xt7uK4ZCaITrC1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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