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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599060a96af53e0be8e76c5eab87486e31b5d89528ff3f271c4445f77fdfdff7' 
  AND token = 'H/43yJnm0zTBrEh2/n2msB1QaROki0C11zrZxgp3y+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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