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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58dca408f1d290ed7094ee7d4cc483ccd63986b5055cf4e488eaa931a0c1ee7b' 
  AND token = 'h8VcJ4kPP5VCRISN4AYH7nSK0tjZKzMmG4eXG8DkMno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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