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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c868e2d84ea614919026c50132b89891e8ffc575585ed11b4a0123fe1d23b2' 
  AND token = 'ba5qv2nEJsp83yLX3LUnLzfwVchdl0k1225Oxi6fWMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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