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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c272ee4042f8e597349ff6345dc1e8e0dbb1b303bc80dadde1d48d3d7050ac17' 
  AND token = 'P4vHox7Rmbazmi805+kJJ3DCP7JmMCwlPsnhCSEBd2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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