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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b4d45e583103d5a88d3f4f804d351d775d3af20f8a141fa43f92fac603f48b' 
  AND token = 'IFtBxqyxaZq3npv3iqLfXD5+chSblQk9GSai6Kz7Ayw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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