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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a2fc82f092ba8b44e1567fab379ef975ec0ec5874f2dd9f0871e1e75072e63' 
  AND token = 'abmeHc2EuqgqKP7sXVh1ZUA+yfY8/43cyzs9sVjhmTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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