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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50ff9122cd632899acbc700c1ac43d7e2922771757080c04f71f3d14a488fc7' 
  AND token = 'osckdL1oHn+j8wDs0mGoYh5jkFaDy/If02lLroVyx/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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