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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7aa71b9b0ce23242ab7d20af4c704d08baba11be21ce20238b9d5bb193d268a' 
  AND token = 'xe/cAvQ8LXDDWdtmbtw02aCWlh1bbudB842OhLJQg40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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