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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b5ebc52fd8db557ab536a176776bb40ac296794510db0a6ca70d5c3f8202ae' 
  AND token = 'Q605fTl3gib4die0z87TzZsRqm3ns+cvhomqaT1gsFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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