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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1e50249c32a9d844f8c5efb29b9f8b2b4e88585725d8c645bd7d0db78cb4b4' 
  AND token = 'uH3KfwLQ3xYaMG3E7X5j6XyNcJqAL39XXHcN5Rp604c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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