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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae37da47bc1a4c15ebe137fc1482f4bc3970e92084def73a2c5bf15dc9cd21d3' 
  AND token = '3Qd9o2ahwbSMDx7/fHG6zoDbin6yWXW9RIFsNTIboKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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