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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2494626bbae1ba493cd4224a8095feb7197ffe616cb6c6b439a1f5b049d934f' 
  AND token = '5BTv5OaCHBUgXg5FCnUnwRQCj7IqwqkwFvEQYMEC41E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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