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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b04381b60c724bb16ca1e913491ff1a6a04084cc61bd8dc9e63656ae0b3d3b4' 
  AND token = 'oBu9ognCHSkmcSInj7lMxdbNW0gU+gTnI0XYP7C3veU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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