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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb153b7d1c8a869981a16a6772aab848a6065669fbf7f6cc8bb5754ead34a3e' 
  AND token = 'QOh5U0uXpxLTL89l6AwbTINM51t/NDJ2irmwo7FCEhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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