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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe9be68f4ed2e6b6a5db63b748acbac819a158e9e816acb013e100f84309365' 
  AND token = 'KBb/irAHHqGJLvxZo1r5dSr1xBfTJTu20ev4+EoQznA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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