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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e584346245c7b3ec1a539dfd42c0fbc2146bc38d61f6f8a48b403205ccc2bc2' 
  AND token = 'GdObsg6ooh90LAkcFSVdD+Q2I+U/nkL+aI4IdAzfqks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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