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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f708681fd617341cd589cbf2ffaf927587540b4e88a7aa8d666a5266ba5311' 
  AND token = 'Pt4o3Rxuddhpw/YnCxuyJ5QOtjy20CswIam4H+3f2bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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