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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f785019a9c252bdfa8affd4501629fc842610595b0f3891d6a0522f92bc391' 
  AND token = 'o23QvAsl/J6tInESHFl9BJL7g9UYZElN2CXsMUd7X0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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