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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd58b40912c7af3bb989eed732f80ef6c329fe88fb6654198d4ff1e28b654a4' 
  AND token = 'f8ntTl2tAjK5c2cP9Dn20ZUereUzKbAZrqvVGjvaPcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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