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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e6c2956acf71ddba30399d527ffd47c19fb86b2d50e165c3873bdf8b6074e3' 
  AND token = 'erwieJx76eccLAxGtkLkVm2N8kZZ/vrMM6d85UstTDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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