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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac767a88cea70a70d5c6e76cc0d1a83ab9af57c5bd85b1c7b959255266894387' 
  AND token = '8HuhnWJyum4f9wl48dmsz4V8QivLCWt+aiIkQFhaseE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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