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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec91f61d5e598d46c04ceb7bbbcfa269d3fba4797707daca8b6000a20f3335ea' 
  AND token = 'ifW9BXPR3ElVvRG/a4cXrm360HfvfdeJJsqQg3yf3jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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