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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155c690c3becb37af7f0564cf61f26bbf4430e3de2ecfb05cc35c8497e981c92' 
  AND token = '1b3RGDIKJTt53m0yp9qlrQ2dGJ03XlbVs+R7KfdOSzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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