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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccdf23ad0ef7eb6b1bc8c3621564610b4ed47fd949f52c9f4a4a1e347dc5ad2' 
  AND token = '9G5rdJm0Nz7znNHostOkcdb7+3YNpzsShKcMOQNXedQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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