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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a488de3d7eb351c81c60c30962f930f10e15678c1908229eb18f499103ad4b' 
  AND token = 'ogAusYV0CqMImah76hf/LCXWmqle0B0CK0LCUt3iIGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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