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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045eb08a6c756a81d90ecebc477cf7ebe2b12ae33562dcbf40a89e4fce08f99b' 
  AND token = 'vy0ey54U4MbALuJpO2AHKqMvjW1Og+SAWjgjw6fJ0/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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