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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1caf87469e1dba37f33e0ff1d84df99e5fb9ac8b43e74269794ef1f309f8ea33' 
  AND token = '2zC9DmtAIQlaGfiZ5EwWibwpVjNBmpFffTFVSySvWLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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