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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02fbbe5c7f00575a84bf931788dfefb3815baff3895e4ab6c459c7b70fd6537' 
  AND token = 'FLm9xu/DFwVSZS0fSPQds2r16WBsAzcT2OlKJZ71q48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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