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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235589a543b9c1d55c8d12836c93ee5f4a0c5b79df8a8d1eb79c40deee0015eb' 
  AND token = 'X4+Jfxz1+Clcc6hphF18/FW07CAgARWLe0KzfPSUwuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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