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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8b10d3c69b86aadf6d2a3a331fe03df5d2c95e24efad74e0dcb5a0705614ce' 
  AND token = 'tv6IjFqXlGSpsdB2XBhHJS/YcB/Rfe/h8IZ54uS4BXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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