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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd126e00c0cd3625521013b0d89a2324b0e86f27aff5169802e08f310f5ef0c8' 
  AND token = 'kumC5brR9tYo50I3dXPpUxKM8o/H/29Ve+jbPV+hZCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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