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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99830ab70b0b47e8b3d3e75e0ae4c85b6bb6ff2e580f9793fc4ddb3eeb0d529c' 
  AND token = 'P9ViiQ3dw5YbvOvk+I23WzXTETVUZYkkFeldNSk0+tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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