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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f92e45addcef81db6d024dc6531cb599ede27846e826c0c048c47b3cc725b4' 
  AND token = 'DJ57hS65VJNo81iV48Thy7xX6NZWcvnw7CgYbTzl4O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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