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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51126e6cff08fe82cf1cb6da6a2fb87e24dae22da770bd1537477c5305b53ad9' 
  AND token = 'hR9hvvmN6p17jtcxcDrSH1iWr/tv5vgQdMV8mNa3ras=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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