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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d81dedf81754ea447df1226b986b0ce7477a37300a2f44bcf30006884789c2a' 
  AND token = 'ZSmiv4i4/Kydha527/W9vnRVzV1+gTgAIkquU85e6d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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