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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a85b410dca8ddb8412ff3a7025caab9f94a19892d126e4e5dd8208cc456c76' 
  AND token = 'ccGyvCzk4UnUQTW0eOyqygvv4536qSnX1pWUkoNl9B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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