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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6557e76e8ec3b5b25033431dd3308e5d81fec40486b8b5db874f021efc9e8ee8' 
  AND token = 'bQ+Je37FJAlubQu/G+MOgqwP0DJvnPeU5/i4HJnYkBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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