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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7d1bd9324efc9e7732d1aa142dc71fe07a558d716db85692e639a3993ac731' 
  AND token = 'feyf27eElrbGlCRfPS/VhsTIig510OJfSPRwgiNnrkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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