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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2875ef11d68aef8a395f07acf1a845f9ce3c67a1480ce606bbb8b910414126b7' 
  AND token = 'xnU9x2WaYaRnjc+Nk23SFD4naWkAxCiYYAFOgSJVS24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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